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Input surge current suppression circuit and method of capacitor

A surge current and suppression circuit technology, which is applied in the direction of emergency protection circuit devices, circuit devices, emergency protection circuit devices, etc. used to limit overcurrent/overvoltage, to achieve good suppression effect, strong versatility, and good suppression effect Effect

Pending Publication Date: 2022-02-01
SOUTHWEST CHINA RES INST OF ELECTRONICS EQUIP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It can be seen that the existing technology has limitations in solving the capacitive input surge current suppression

Method used

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  • Input surge current suppression circuit and method of capacitor
  • Input surge current suppression circuit and method of capacitor
  • Input surge current suppression circuit and method of capacitor

Examples

Experimental program
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Effect test

Embodiment 1

[0030] In this embodiment, the capacity of the energy storage capacitor is set to 120uF, and the original figure 1 with figure 2 Pins 1 and 2 are connected to 270V DC power supply. Perform a power-on input transient from 0V to 270V on the input power supply, and conduct a steady-state input transient simulation test from 270V to 400V again at 0.1s. The simulation waveform is as follows image 3 with Figure 4 shown. There are three waveforms in the simulation waveform diagram, the upper one is the input voltage, the middle one is the capacitor voltage, and the lower one is the surge current.

[0031] Compared image 3 with Figure 4 For the two simulation waveforms, at the moment of power-on input at 0s, both the prior art and the present invention effectively suppress the input surge current, the capacitor voltage rises slowly, and the slow start effect is good. The capacitor voltage then reaches the input voltage and enters steady-state operation. In steady state ope...

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PUM

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Abstract

The invention discloses an input surge current suppression circuit and method of a capacitor, and relates to the technical field of power electronics. The input surge current suppression circuit comprises a variable resistance circuit, a detection control unit is arranged for the conduction internal resistor of a field effect transistor Q1 in the variable resistance circuit, the detection control unit is used for detecting the flowing surge current, and when the surge current is greater than a set value, the variable resistance circuit is immediately recovered to high resistance, so that the energy storage capacitor branch is cut off from the load of the input power supply, and the input surge current is suppressed. The input surge current suppression circuit is simple, low in cost, good in power-on surge current suppression effect and high in universality.

Description

technical field [0001] The present invention relates to the technical field of power electronics, more specifically, a capacitor input surge current suppression circuit and method. Background technique [0002] When the load of the DC power supply has a large pulsating power, a large-capacity capacitor is often connected in parallel to the load power supply end to provide pulse power and reduce the disturbance to the input power supply. The connection of large-capacity capacitors will cause input surge problems, that is, when the input voltage jumps sharply upwards, it will cause a large surge current and cause damage to the line. [0003] The upward jump of the input voltage is divided into two cases. The first case is a violent upward jump when powering on, and the second case is a violent upward jump during steady-state operation. [0004] For the first case, the patent "A Capacitor Power-On Surge Current Suppression Circuit and Method" with the application number CN2020...

Claims

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Application Information

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IPC IPC(8): H02H9/02
CPCH02H9/025
Inventor 余俊宏徐意婷王蓉王凤岩黄付刚赵伟刚王斌
Owner SOUTHWEST CHINA RES INST OF ELECTRONICS EQUIP